app windows move slightly when you click on different windows within main app windows

when I have the app maximized and have say six windows open and tiled, for example contact, company, task list and a couple others and I switch the focus (ie I click on) from say the contact window to the task list, the entire app moves slightly making my mouse select 2 records from the task list instead of what I actually pointed to.

it is a very frustrating aspect of this application which I hope is corrected.